Causeway Services
Four-valued logic, sold per call: Belnap's logic as an x402 API neighborhood
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Four-valued logic, sold per call: Belnap's logic as an x402 API
Eight endpoints at $0.001 to $0.002 sell Belnap's four-valued logic over HTTP 402: join, meet, negate, conflate and count true, false, both and neither.
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Causeway Services: x402 guides, a market where software pays, books, news and games
Causeway Services runs an x402 market of 130 offers payable in USDC over HTTP 402, and publishes guides, books, Koios News and games. Start here.